Liquid crystal writing film with white handwriting and liquid crystal blackboard

Abstract

The invention provides a liquid crystal writing film for white handwriting. The liquid crystal writing film with the white handwriting at least comprises two liquid crystal layers, and white display of the written handwriting is achieved through specific design.

Description

Technical Field

[0001] The invention relates to the technical field of liquid crystal writing films, in particular to a liquid crystal writing film with white writing and a liquid crystal blackboard. Background Art

[0002] The widely used LCD writing boards on the market are mainly based on the optical properties of cholesteric liquid crystals, which achieve a variety of writing colors by reflecting light of different wavelengths. These devices are able to produce a variety of colors from red to purple in the visible light range, and usually use a black background to enhance the visual contrast of handwriting. However, standard LCD blackboards are usually limited to displaying a single color, or achieving multiple color effects by reflecting liquid crystals of different wavelengths in specific areas, but this is not enough to achieve the versatility of switching colors in any writing area.

[0003] In the prior art, although a solution has been developed to switch the color in any writing area by superimposing multiple liquid crystal film layers, each liquid crystal layer includes two conductive layers and a liquid crystal layer, and is controlled by a specific circuit to reflect light of different wavelengths, thereby realizing the switching of multi-layer liquid crystal colors to show a multi-color effect. However, since the handwriting color band of the liquid crystal handwriting board is between red light and purple light, and is matched with a black base, the handwriting contrast is not strong enough, resulting in the handwriting not being able to be fully seen when the user is at a long viewing distance because the handwriting is not prominent enough. At present, neither monochrome nor multi-color liquid crystal writing boards can fully achieve the full-color handwriting effect of traditional blackboards, especially the type of black background and white characters. Even for multi-color liquid crystal writing boards, color switching can only be achieved between red and purple, and white handwriting is lacking. There is a defect in the technology of realizing a multi-color liquid crystal blackboard by superimposing multiple liquid crystal film layers, that is, when specific multiple layers of colors are written at the same time, only the color of the surface liquid crystal layer can be displayed. In order to achieve more color effects, more layers of structures need to be superimposed, which greatly increases the production cost and reduces the production yield.

[0004] Therefore, although the existing multi-color LCD writing board technology has achieved colorful display to some extent, there are still problems such as insufficient color contrast, lack of white writing and high production cost. These problems limit its popularity in practical application scenarios and the improvement of user experience. It is particularly critical and necessary to develop a new type of LCD writing board to solve these limitations. Summary of the invention

[0005] The main purpose of the present invention is to provide a liquid crystal writing film with white ink, aiming to solve the current technical problems of insufficient color contrast, lack of white ink and high production cost. This new liquid crystal writing film can effectively improve the display effect and user experience through innovative design and technical means, while reducing manufacturing costs, bringing significant technological innovation and application value to related fields.

[0006] To achieve the above object, the present invention provides a liquid crystal writing film with white writing, wherein the liquid crystal writing film with white writing comprises at least two liquid crystal layers, and the writing on the liquid crystal writing film with white writing is white. The reflectivity ratio of the liquid crystal layer in the liquid crystal writing film with white writing gradually increases from the surface layer to the bottom layer. This design makes the written content more clearly visible, especially under a dark background, the contrast of the white writing is higher, and it is easier to read and identify, thereby improving the user experience.

[0007] The wavelength distribution range of the liquid crystal writing film proposed by the present invention is between 400nm and 700nm, which is suitable for a wide range of display and writing applications, so that the liquid crystal writing film has a wide range of application potentials in various scenarios such as education, office and home.

[0008] Furthermore, the liquid crystal writing film for white writing includes two liquid crystal layers, and the film layer structure from top to bottom is AG layer, first substrate layer, first conductive film layer, first liquid crystal layer, second conductive film layer, second substrate layer, first adhesive layer, third substrate layer, third conductive film layer, second liquid crystal layer, fourth conductive film layer, fourth substrate layer second adhesive layer and base layer. When the liquid crystal layer in the liquid crystal writing film is two layers of liquid crystal layers, the reflectivity percentage of the surface liquid crystal layer is 15% to 45%, and the reflectivity percentage of the bottom liquid crystal layer is 55% to 85%. This design not only optimizes the visual effect of writing, but also improves the visibility and contrast of the handwriting. The color combination reflected by the two liquid crystal layers is one of red and cyan, green and magenta, blue and yellow, orange and light blue, yellow-green and purple, pink and light cyan.

[0009] Furthermore, the control circuit is a microprocessor control unit, which realizes precise control of each conductive area through software programming to adjust the transmittance and reflectivity of different liquid crystal layers. The use of the microprocessor greatly improves the intelligence level of the system, making the operation of the liquid crystal writing film easier and faster, and also provides the possibility for future function expansion and upgrading.

[0010] Furthermore, the first substrate layer, the second substrate layer, and the third substrate layer are made of transparent polymer materials, and the fourth substrate layer can be transparent or black. The use of transparent polymer materials ensures the overall transparency and aesthetics of the writing film, while the black fourth substrate can be selected according to actual needs to meet different usage scenarios and aesthetic requirements.

[0011] Furthermore, the base layer is a hard back plate, which provides structural support and protects the internal circuit from external influences. The use of the hard back plate not only enhances the stability and durability of the writing film, but also effectively prevents the internal circuit from being affected and damaged by the external environment, thereby extending the service life of the product.

[0012] The present invention also provides a liquid crystal blackboard, wherein a handwriting color changing device is provided on the liquid crystal blackboard. The handwriting color changing device is electrically connected to the control circuit, and the handwriting color can be easily changed by the handwriting color changing device.

[0013] In addition, the liquid crystal blackboard also includes an erasing position positioning device, which is also electrically connected to the control circuit, and the position of the handwriting to be erased can be accurately positioned and erased through the erasing position positioning device.

[0014] The liquid crystal blackboard also includes a handwriting storage unit and a communication unit for transmitting external signals;

[0015] Wherein: the handwriting storage unit is used to record the user's writing content on the liquid crystal blackboard, including the color, shape, position and timestamp of the handwriting, so as to facilitate subsequent viewing or recovery; the communication unit supports the wireless communication protocol, so that the liquid crystal blackboard can exchange data with other intelligent devices;

[0016] Through the communication unit, the liquid crystal blackboard can receive signals or instructions from external devices;

[0017] The communication unit can export the data stored in the handwriting storage unit to an external storage medium or a cloud server to achieve data backup and sharing;

[0018] The communication unit can also enable the LCD blackboard to have a remote control function, and the user can operate and manage the blackboard at different locations through a dedicated application program;

[0019] The communication unit supports a real-time synchronization function to ensure that information between multiple liquid crystal blackboards or between a liquid crystal blackboard and a mobile device remains consistent.

[0020] The present application provides a white ink liquid crystal writing film and a matching liquid crystal blackboard, which have the following

[0021] Beneficial effects:

[0022] 1. Improve the display effect: By designing white characters, the written content is more clearly visible against a dark background. This high-contrast design significantly improves the user experience, especially in dimly lit environments.

[0023] 2. Multi-layer structure design: The liquid crystal writing film adopts a multi-layer structure, which not only ensures the strength and durability of the product, but also realizes the precise control and management of light. This structural design effectively extends the service life of the product and ensures the stability of the display effect.

[0024] 3. Intelligent operation: Both the LCD writing film and the LCD blackboard are equipped with control circuits and microprocessors, and users can achieve precise control of each conductive area through software programming. This greatly improves the functionality and flexibility of the writing film and makes the operation easier and faster.

[0025] 4. Color can be changed: The LCD blackboard is equipped with a handwriting color changing device, and users can easily change the required handwriting color to meet the writing needs in different scenarios.

[0026] 5. Precise erasing function: Equipped with an erasing position positioning device, it can accurately locate and erase the handwriting position to be erased, improving the convenience and efficiency of use.

[0027] 6. Data recording and backup: The LCD blackboard also includes a handwriting storage unit that can record everything the user writes, including information such as color, shape, location, and timestamp. These data can be exported to external storage media or cloud servers through the communication unit to achieve data backup and sharing.

[0028] 7. Remote control and real-time synchronization: The communication unit supports wireless communication protocols, enabling the LCD blackboard to exchange data with other smart devices and have remote control functions. Users can operate and manage the blackboard through dedicated applications at different locations. In addition, the communication unit supports real-time synchronization to ensure that the information between multiple LCD blackboards or between the LCD blackboard and mobile devices remains consistent.

[0029] 8. Broad application prospects: Due to its excellent display effect, durability and intelligent characteristics, the liquid crystal writing film and liquid crystal blackboard are suitable for a variety of application scenarios, such as education, office, home, etc., and have broad application prospects.

[0030] In summary, this application significantly improves the performance and user experience of liquid crystal writing film and liquid crystal blackboard through innovative design and technical means, providing users with a more efficient, convenient and intelligent solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic structural diagram of a liquid crystal writing film with white ink in one embodiment of the present invention;

[0032] Figure 2 It is a schematic structural diagram of a liquid crystal writing film with white ink in another embodiment of the present invention;

[0033] Figure 3 4 is a circuit module diagram of a liquid crystal blackboard in one embodiment of the present invention. DETAILED DESCRIPTION

[0034] The scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example 1

[0036] Please refer to Figure 1 , this embodiment shows a white handwriting liquid crystal writing film, which is designed to provide excellent display effects and user experience. The present invention proposes a liquid crystal writing film with a white handwriting display function, which includes at least two liquid crystal layers. The design makes the written content more clearly visible against a dark background, thereby improving the user experience. This design is particularly suitable for a variety of scenarios such as education, office, and home, and has a wide range of application potential. In this embodiment, the liquid crystal writing film includes two liquid crystal layers, and the film layer structure from top to bottom is AG layer 10, first substrate layer 11, first conductive film layer 12, first liquid crystal layer 13, second conductive film layer 14, second substrate layer 15, first adhesive layer 16, third substrate layer 17, third conductive film layer 18, second liquid crystal layer 19, fourth conductive film layer 20, fourth substrate layer 21, second adhesive layer 22 and base layer 23. When there are two layers of liquid crystal, the reflectivity percentage of the surface liquid crystal layer ranges from 15% to 45%, and the reflectivity percentage of the bottom liquid crystal layer ranges from 55% to 85%. The reflectivity percentage of the liquid crystal layer in the liquid crystal writing film of white handwriting gradually increases from the surface to the bottom. In this embodiment, the reflectivity percentage of the surface liquid crystal layer is 45%, and the reflectivity percentage of the bottom liquid crystal layer is 55%. This design not only optimizes the visual effect of writing, but also improves the visibility and contrast of the handwriting. The color combinations reflected by the two liquid crystal layers are diverse and can be selected according to actual needs.

[0037] In addition, the first substrate layer 11, the second substrate layer 15, and the third substrate layer 17 of the liquid crystal writing film of this embodiment are all made of transparent polymer materials, which ensures the overall transparency and aesthetics of the writing film. The fourth substrate layer 21 can be transparent or black, which can be selected according to actual needs to meet different usage scenarios and aesthetic requirements.

[0038] Finally, the base layer 23 of the liquid crystal writing film of this embodiment is a hard back plate, which provides structural support and protects the internal circuit from external influences. The use of the hard back plate not only enhances the stability and durability of the writing film, but also effectively prevents the internal circuit from being affected and damaged by the external environment, thereby extending the service life of the product.

[0039] For example, in liquid crystal display technology, white light can be created by combining different colors of light. This process uses the principle of color superposition, which means that different colors of light will produce new colors when they overlap. Here are some common color combinations and their effects:

[0040] 1. Red plus cyan equals white: When red light and cyan light are superimposed, they can cover most of the color range in the color spectrum, thus producing light close to white. This is because the combination of red and cyan can complement each other's missing parts of the spectrum to form a more complete white light.

[0041] 2. Green plus magenta equals white: Green light and magenta light can also produce white light when superimposed. Green light mainly occupies the middle of the visible spectrum, while magenta light tends to the two ends. When the two colors are combined, they can cover the entire visible spectrum and form white.

[0042] 3. Blue plus yellow equals white: The combination of blue light and yellow light is also based on the same principle. Blue light tends to one end of the spectrum, while yellow light tends to the other end. When the two are combined, they can cover the entire visible spectrum, thus forming white light.

[0043] 4. Orange plus light blue equals white: The combination of orange light and light blue light can also produce white light. Orange light is between red and yellow, while light blue light is between blue and green. The combination of these two colors can cover the entire visible spectrum from red to purple to form white.

[0044] 5. Yellow-green plus purple equals white: The combination of yellow-green light and purple light can also produce white light. Yellow-green light is between green and yellow, while purple light is between red and blue. The combination of these two colors can cover the entire visible spectrum from red to blue to form white.

[0045] 6. Pink plus cyan equals white: The combination of pink light and cyan light can also produce white light. Pink light is between red and white, while cyan light is between blue and green. The combination of these two colors can cover the entire visible spectrum from red to blue, forming white.

[0046] These color combinations are achieved by precisely controlling the transmittance and reflectivity in the liquid crystal layer. Each layer of liquid crystal can independently adjust its color output to achieve different color superposition effects. For example, by adjusting the first layer of liquid crystal to red light and the second layer of liquid crystal to cyan light, the superposition of the two layers of light can produce white writing. This design not only improves the display effect, but also increases the flexibility and diversity of the display.

[0047] The white handwriting liquid crystal writing film of this embodiment has a number of technical advantages. First, the white handwriting design makes the written content more clearly visible against a dark background, improving the user experience. Second, the multi-layer structure design not only ensures the strength and durability of the writing film, but also realizes the precise control and management of light, achieving an excellent display effect. Finally, the use of a microprocessor improves the intelligence level of the system, making the operation easier and faster. In summary, the white handwriting liquid crystal writing film provided by this embodiment is suitable for a variety of application scenarios and has a wide range of application prospects.

[0048] In addition, the present invention also provides a liquid crystal blackboard, wherein the liquid crystal blackboard is provided with a handwriting color changing device. The handwriting color changing device is electrically connected to the control circuit, and the handwriting color can be easily changed by the handwriting color changing device.

[0049] In addition, the liquid crystal blackboard also includes an erasing position positioning device, which is also electrically connected to the control circuit, and the position of the handwriting to be erased can be accurately positioned and erased through the erasing positioning device.

[0050] The liquid crystal blackboard also includes a handwriting storage unit and a communication unit for transmitting external signals;

[0051] Wherein: the handwriting storage unit is used to record the user's writing content on the liquid crystal blackboard, including the color, shape, position and timestamp of the handwriting, so as to facilitate subsequent viewing or recovery; the communication unit supports the wireless communication protocol, so that the liquid crystal blackboard can exchange data with other intelligent devices;

[0052] Through the communication unit, the liquid crystal blackboard can receive signals or instructions from external devices;

[0053] The communication unit can export the data stored in the handwriting storage unit to an external storage medium or a cloud server to achieve data backup and sharing;

[0054] The communication unit can also enable the LCD blackboard to have a remote control function, and the user can operate and manage the blackboard at different locations through a dedicated application program;

[0055] The communication unit supports a real-time synchronization function to ensure that information between multiple liquid crystal blackboards or between a liquid crystal blackboard and a mobile device remains consistent.

[0056] Example 2

[0057] Please refer to Figure 2This embodiment proposes a liquid crystal writing film with white handwriting and a liquid crystal blackboard using the liquid crystal writing film. The liquid crystal writing film with white handwriting includes three liquid crystal layers, each of which reflects light of different wavelengths, namely red, green and blue in the standard colors, and the hierarchical colors are arranged from top to bottom as red, green and blue. In order to make the liquid crystal blackboard present white handwriting. When red light, green light and blue light overlap, they become white light. Therefore, when two or more specific liquid crystal layers reflecting different wavelengths overlap, white liquid crystal writing handwriting is produced. However, simply superimposing cannot make the liquid crystal layer finally produce a white light effect. Because the superimposed structure of the liquid crystal layer makes the light intensity and degree reflected by each layer of liquid crystal have different strengths and weaknesses, and the liquid crystal layer on the surface reflects more light, and finally only the color of the liquid crystal on the surface is displayed. The design of the liquid crystal writing film with white handwriting and the liquid crystal blackboard proposed by the present invention realizes that under natural light conditions, when the three colors of RGB are written at the same time, the color displayed at the writing place is white handwriting by accurately adjusting the proportion of light wavelengths reflected by the RGB three-color liquid crystal layer and the brightness level. This design not only improves the use effect of the LCD blackboard, but also brings new teaching tools to the education field.

[0058] Specifically, by adjusting the content of the chiral agent in the formula, the red light reflection band is 660-720nm, the green light reflection band is 520-560nm, and the blue light reflection band is 430-450nm. This ensures that each color of light can be accurately reflected. By adjusting the content of the glue system in the formula, the reflectivity percentage of the liquid crystal layer reflecting red is 40% to 60%, the reflectivity percentage of the liquid crystal layer reflecting green is 30% to 45%, and the reflectivity percentage of the liquid crystal layer reflecting blue is 10% to 35%. This ensures that the intensity of light of different colors is moderate and will not be too strong or too weak. The three liquid crystal layers are superimposed in the order of red, green, and blue to form a complete liquid crystal writing film with white handwriting. This superimposed structure allows light of different colors to interfere and diffract after passing through multiple liquid crystal layers, thereby producing the effect of white handwriting. Under natural light conditions, when the three colors of RGB are written at the same time, due to the scattering and reflection of light, light of different colors can be mixed evenly in space to form the effect of white handwriting.

[0059] In summary, the design of the white-inked liquid crystal writing film and liquid crystal blackboard proposed in this application achieves that under natural light conditions, when the three colors of RGB are written at the same time, the color displayed at the writing place is white ink, by accurately adjusting the proportion of light wavelengths reflected by the RGB three-color liquid crystal layer and the brightness. This design not only improves the use effect of the liquid crystal blackboard, but also brings new teaching tools to the field of education.

[0060] Please refer to Figure 2 and Figure 3In this embodiment, the liquid crystal writing film of white writing includes three liquid crystal layers, and the film layer structure from top to bottom is the second AG layer 100, the fifth substrate layer 101, the fifth conductive film layer 102, the third liquid crystal layer 103, the sixth conductive film layer 104, the sixth substrate layer 105, the seventh conductive film layer 106, the fourth liquid crystal layer 107, the eighth conductive film layer 108, the seventh substrate layer 109, the ninth conductive film layer 110, the fifth liquid crystal layer 111, the tenth conductive film layer 112, the eighth substrate layer 113, the third adhesive layer 114, and the second substrate layer 115. The fifth substrate layer 101, the sixth substrate layer 105, the seventh substrate layer 109, and the eighth substrate layer 113 are made of transparent polymer materials and have good optical transparency and mechanical strength. These substrate layers can not only ensure that light can pass through smoothly, but also provide sufficient structural stability to support the normal operation of the liquid crystal layer. The three liquid crystal layers use four substrate layers, that is, the sixth substrate layer 105 and the seventh substrate layer 109 are both coated with conductive films on both sides. Compared with the traditional liquid crystal writing film, this embodiment saves two substrate layers, which can save production costs. The second AG layer 100 is an anti-glare layer, which is used to reduce the impact of ambient light on the display effect and improve viewing comfort. The anti-glare layer reduces direct reflection by scattering the incoming light, thereby effectively reducing glare, so that users can get a clear visual experience under various lighting conditions. The base layer is a hard backplane, which provides structural support and protects the internal circuit from external influences. The hard backplane not only enhances the structural integrity of the entire liquid crystal blackboard, but also plays a protective role to prevent external physical impact from damaging the internal circuit.

[0061] Further, in this embodiment, the three liquid crystal layers are provided with independent control circuits, and the fifth conductive film layer 102, the sixth conductive film layer 104, the seventh conductive film layer 106, the eighth conductive film layer 108, the ninth conductive film layer 110, and the tenth conductive film layer 112 are respectively divided into a plurality of conductive regions, and the conductive regions are controlled by the control circuit. The three liquid crystal layers are provided with independent control circuits, so that accurate control of each liquid crystal layer is achieved. The on or off state of each conductive region is relatively independent, and the circuits are not connected to each other, so that when writing, light of different colors can be accurately reflected to form the desired color effect. At the same time, this design can also avoid problems such as short circuits caused by circuit connectivity, thereby improving the safety and stability of the liquid crystal blackboard. The fifth conductive film layer 102, the sixth conductive film layer 104, the seventh conductive film layer 106, the eighth conductive film layer 108, the ninth conductive film layer 110, and the tenth conductive film layer 112 are respectively divided into a plurality of conductive regions, and the on or off state of each conductive region is relatively independent, and the circuits are not connected to each other. The conductive areas of the upper and lower film layers are arranged in a crisscross pattern in space, and cooperate with the positioning device to enable the blackboard to have a local erasing function. Through this design, precise erasing of specific areas can be achieved, improving teaching efficiency and flexibility.

[0062] Furthermore, the control circuit is a microprocessor control unit, which realizes precise control of each conductive area through software programming to adjust the transmittance and reflectivity of different liquid crystal layers.

[0063] The present invention also proposes a liquid crystal blackboard, wherein a handwriting color switching device is provided on the liquid crystal blackboard. The handwriting color switching device is electrically connected to the control circuit, and the desired handwriting color can be easily switched through the handwriting color switching device. When it is necessary to switch to other colors except white handwriting, it is only necessary to control the switch of each liquid crystal layer to complete the switching. For example, when red handwriting is required, the green and blue liquid crystal layers are driven and locked, and the handwriting is red at this time. When yellow handwriting is required, the blue layer is closed, and the red and green layers are opened, and the superimposed color is yellow at this time. Because the liquid crystal of each layer is adjusted by the reflection wavelength and brightness, the superimposed color is determined by the multiple layers rather than the surface color. Similarly, the following colors can be obtained: red, green, blue, cyan, yellow, and magenta. In addition, the liquid crystal blackboard also includes an erasing position positioning device. The erasing position positioning device is also electrically connected to the control circuit, and the handwriting position to be erased can be accurately located and erased through the erasing positioning device. The liquid crystal blackboard of the present invention cleverly integrates the handwriting color changing device and the erasing position positioning device, which are electrically connected through a precise control circuit, and together bring users an unprecedented writing and erasing experience. When the user wants to change the handwriting color, he only needs to gently operate the color changing device, and the device will immediately send instructions to the control circuit. After receiving these instructions, the control circuit quickly adjusts the brightness ratio of the RGB light source in the liquid crystal layer, so that the newly written handwriting is presented in the color selected by the user. The whole process is smooth and instant, which greatly enriches the color expression of the writing.

[0064] At the same time, the LCD blackboard is also equipped with a high-precision erasing position positioning device. This device has built-in advanced sensor technology, which can capture the user's erasing actions on the LCD blackboard in real time and convert these actions into precise position information. Subsequently, this information is transmitted to the control circuit, which calculates the specific area range that needs to be erased based on this information, and instructs the liquid crystal layer to adjust the transmittance and reflectivity in the area, so that the handwriting gradually disappears and partial erasure is achieved. This design not only improves the accuracy and efficiency of erasing, but also effectively avoids the dust pollution generated by traditional blackboard erasing, creating a cleaner, healthier and more efficient learning environment for users.

[0065] The liquid crystal blackboard of the present invention not only has the advanced functions of handwriting color exchange and erasure positioning, but also integrates a handwriting storage unit and a communication unit, providing users with a more comprehensive and convenient user experience. The handwriting storage unit, as the memory center of the liquid crystal blackboard, can record in detail every handwriting written by the user on the blackboard, including key information such as color, shape, position and timestamp. These data are stored safely, making it convenient for users to review or restore previous writing content at any time when needed.

[0066] The communication unit gives the LCD blackboard the ability to connect to the outside world. It supports a variety of wireless communication protocols, allowing the LCD blackboard to be easily connected to other smart devices, such as smartphones, tablets or computers. Through the communication unit, the LCD blackboard can receive signals or instructions from these external devices to achieve remote control and operation. For example, users can write, erase or perform other management operations on the blackboard through dedicated applications in different locations, greatly improving the flexibility and convenience of use.

[0067] In addition, the communication unit also undertakes the important task of data exchange. It can export the data stored in the handwriting storage unit to an external storage medium or a cloud server to realize data backup and sharing. This means that users can not only save important writing content, but also easily share it with others or synchronize this data between different devices. At the same time, the real-time synchronization function supported by the communication unit ensures that the information between multiple LCD blackboards or between LCD blackboards and mobile devices remains consistent, so that users can get a consistent user experience no matter where they operate.

[0068] It should be noted that the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0069] The above description is only a partial or preferred embodiment of the present invention. Neither the text nor the drawings can limit the scope of protection of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the overall concept of the present invention, or direct / indirect application in other related technical fields are included in the scope of protection of the present invention.

Claims

1. A liquid crystal writing film with white writing, characterized in that: The liquid crystal writing film with white writing includes at least two liquid crystal layers, and the writing on the liquid crystal writing film with white writing is white.

2. The liquid crystal writing film with white writing according to claim 1, characterized in that: The wavelength distribution range of the white-writing liquid crystal writing film is 400nm-700nm.

3. The liquid crystal writing film with white writing according to claim 1, characterized in that: The reflectivity ratio of the liquid crystal layer in the liquid crystal writing film with white writing gradually increases from the surface layer to the bottom layer.

4. The liquid crystal writing film with white writing according to claim 1, characterized in that: The liquid crystal writing film with white writing comprises two liquid crystal layers, the reflectivity percentage of the surface liquid crystal layer is 15% to 45%, and the reflectivity percentage of the bottom liquid crystal layer is 55% to 85%.

5. The liquid crystal writing film with white writing according to claim 1, characterized in that: The liquid crystal writing film for white writing includes two liquid crystal layers, and the film layer structure from top to bottom is AG layer, first substrate layer, first conductive film layer, first liquid crystal layer, second conductive film layer, second substrate layer, first glue layer, third substrate layer, third conductive film layer, second liquid crystal layer, fourth conductive film layer, fourth substrate layer second glue layer and base layer.

6. The liquid crystal writing film with white writing according to claim 5, characterized in that: The color combination reflected by the two liquid crystal layers is one of red and cyan, green and magenta, blue and yellow, orange and light blue, yellow-green and purple, pink and light cyan.

7. The liquid crystal writing film with white writing according to claim 5, characterized in that: Both liquid crystal layers are provided with independent control circuits. The first conductive film layer, the second conductive film layer, the third conductive film layer and the fourth conductive film layer are respectively divided into a plurality of conductive regions, and the conductive regions are controlled by the control circuits.

8. The liquid crystal writing film with white writing according to claim 7, characterized in that: The control circuit is a microprocessor control unit, which realizes precise control of each conductive area through software programming to adjust the transmittance and reflectivity of different liquid crystal layers.

9. The liquid crystal writing film with white writing according to claim 5, characterized in that: The first substrate layer, the second substrate layer and the third substrate layer are made of transparent polymer materials, and the fourth substrate layer can be transparent or black.

10. A liquid crystal blackboard, characterized in that: The liquid crystal blackboard comprises the liquid crystal writing film with white writing according to any one of claims 1 to 8; Wherein, a handwriting color changing device is provided on the liquid crystal blackboard, and the handwriting color changing device is electrically connected to the control circuit, and the required handwriting color is changed through the handwriting color changing device.

11. The liquid crystal blackboard according to claim 10, characterized in that: The liquid crystal blackboard also includes an erasing position positioning device, which is electrically connected to the control circuit. The position of the handwriting to be erased can be determined by the erasing position positioning device.

12. The liquid crystal blackboard according to claim 11, characterized in that: The liquid crystal blackboard also includes a handwriting storage unit and a communication unit for transmitting external signals; Wherein: the handwriting storage unit is used to record the user's writing content on the liquid crystal blackboard, including the color, shape, position and timestamp of the handwriting, so as to facilitate subsequent viewing or recovery; the communication unit supports the wireless communication protocol, so that the liquid crystal blackboard can exchange data with other intelligent devices; Through the communication unit, the liquid crystal blackboard can receive signals or instructions from external devices; The communication unit can export the data stored in the handwriting storage unit to an external storage medium or a cloud server to achieve data backup and sharing; The communication unit can also enable the LCD blackboard to have a remote control function, and the user can operate and manage the blackboard at different locations through a dedicated application program; The communication unit supports a real-time synchronization function to ensure that information between multiple liquid crystal blackboards or between a liquid crystal blackboard and a mobile device remains consistent.

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